DESCRIPTION OF BUSINESS (Details)	Sep. 30, 2012 item
DESCRIPTION OF BUSINESS
Number of sites that underwent groundwater restoration and reclamation activities	2

Represents the number of sites on which uranium previous production had occurred and that groundwater restoration and reclamation activities had or are being conducted.

No definition available.

Name:	urre_NumberOfSitesSubjectedToGroundwaterRestorationAndReclamationActivities
Namespace Prefix:	urre_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant